Abscisic Acid

Q.

The combination of hormones that can induce flowering in pineapple plants is

1. Cytokinin and Abscisic acid

2. Auxin and Ethylene

3. Gibberellin and Cytokinin

4. Gibberellin and Abscisic acid

Q.

What are plant hormones? Name the plant hormones responsible for the following: (i) Growth of stem (ii) Promotion of cell division (iii) Inhibition of growth

Q. Abscisic acid is also known as

1. $\text{abscisin II}$
2. $\text{inhibitor}\beta$
3. $\text{dormin}$
4. $\text{all the above}$

Q.

What are the different plant growth hormones?

Q.

Which is a stress hormone?

1. Abscisic acid

2. Dichlorophenoxy acetic acid

3. Benzyl aminopurine

4. Ethylene

Q. Which of the following PGR is also known as anti-gibberellin?

1. Auxin
2. Ethylene
3. Abscisic acid
4. Cytokinin

Q.

Which hormone controls apical dominance? List any two functions of the hormones.

Q. Ethylene reduces respiratory rate during fruit ripening.

1. False
2. True

Q.

ABA, is involved in

1. Dormancy of seeds

2. Root elongation

3. Shoot elongation

4. Increased cell- division

Q. is a phytohormone which plays an important role in regulating abscission and dormancy.

1. auxin
2. cytokinin
3. gibberellin
4. abscisic acid

Q. Identify the scientist who first isolated a plant growth inhibitor from cotton fruit.

1. H.H Cousins
2. Skoog and Miller
3. F. Addicot
4. E. Kurosawa

Q. The hormone that induces closure of stomata and reduces the transpiration loss of water is

1. Abscisic acid
2. Auxins
3. Cytokinins
4. Gibberellins

Q. Which of the following is/are the function(s) of abscisic acid (ABA)?

1. ABA prevents seed germination under unfavourable conditions.
2. ABA helps seed to withstand dessication.
3. ABA inhibits leaf senescence.
4. ABA induces stomatal closure.

Q.

Seed dormancy is due to the:

1. Ethylene

2. Abscisic acid

3. IAA

4. Starch